Wrench.



UNITED STATES PAT NT orr on.

KING A. HARVIE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOB TO WEAR WRENCHCOMPANY, A CORPORATION OF MASSACHUSETTS.

WRENCH.

T 0 all whom it may concern:

Be it known that I, KIM; A. HARVIE, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements in 'Wrenches,of which the following is a specification.

The invention relates to pipe Wrenches and has for its object to provideimproved means for facilitating the action of the wrench in adaptingitself to pipes and other work of varying sizes, and to increase theeconomy and efliciency of construction for marketable purposes.

Other objects and advantages should be readily apparent by reference tothe following description taken in connection with the accompanyingdrawings, and it willbe ununderstood that modifications in the specificdetails of construction falling in the'scope of the appended claims maybe made withof the invention.

Figure I represents a rear view shown partly in section at the pivot.Fig. II is a perspective View. Fig. III shows one side of the rotaryFig. IV shows the other side of the rotary jaw. Fig. V shows the pivotpin. Fig. VI shows the spring for the rotary jaw. Fig. VII is a partialsection showing the attachment of the fixed jaw to the wrench.

Referring to the drawings, in which corresponding parts are representedby the same reference characters, an eccentric rotary cam jaw 1, thegripping surface of which is preferably not corrugated or cut withteeth, is pivoted in the recessed handle 2 on the pivot 3. The engagingface 4 of the rotary jaw is eccentric to the pivot 3 and approaches orretreats from the fixed jaw 5 in accordance with the direction of itsmovement on the pivot 3.

In a circular recess 6 (see Fig. IV) surrounding the pivot on one sideof the rotary jaw is placed the spiral spring 7, having one end engagedin the recess 8 in the rotary jaw, and the other end held in the recess9 in the handle. This spring is wound in such manner that a rotation ofthe rotary jaw away from the fixed jaw will set up a tension in thespring tending to return the rotary jaw back toward the fixed jaw. Asecond recess 8' in the bottom of recess 6 Specification of LettersPatent.

Patented Dec. 1, 1914.

Application filed February 12, 1913. Serial No. 747,956.

wall of the rotary jaw adapted to admit a a pin 16 (Fig. I) in the wallof the handle. This pin acts as 'a limit stop for the rotary cam, beingso positioned that it will engage the'edge of the internal boss 11 atthe points 11, acting thus as a limit stop at both ends and determiningthe travel of. the rotary 151W;

The fixed jaw 5 consists of a channel box jacket 13 (F 1g. VII) ofhardened material having cut teeth 14 in its gripping face and tapped,riveted, or otherwise secured to its supporting projection or. stud 15on the hanout departing from or exceeding the spirit d1 In operation,which is extremely simple, the rotary jaw is pulled back away from thefixed jaw against the tension of the spring. The fixed jaw is thenbrought up against the pipe or object to be grasped and the rotary jawreleased, the spring causing the rotary jaw to return toward the fixedjaw until it engages the other side of the pipe or the work to begrasped. The handle of the wrench is then grasped as in the ordinarypipe wrench, the pull on the handle tending to increase the pressurebetween the work and rotary jaw, the work being grasped firmly andcarried around in the jaws.

It will be noted that in this wrench there are no teeth at all on therotary aw this is of prime importance both in operation and manufacture.It obviates a great deal of the usual scoring of the pipe section, dueto the slip of the jaws on the pipe, the pipe usually not only beingmarked by the teeth but scored in long, deep scratches by the teeth asthey slide around the pipe. lVhere teeth are out on the rotary jaw it isnecessary to make this jaw of material in which the teeth can be cut toa biting edge and of sufficient hardness to stand the constant usage,making it thus so diflicult'and expensive as to be mechanicallyimpractical. The rotary jaw of this Wrench may be pressed or casteasily,eiliciently and, inexpensively. The provision of the spring tobring the rotary aw into engagement with the work saves the use of onehand and enhances its facility of operation to a wonderful extent,making the action practically automatic. It also prevents initial slipon the pipe. My method of making the removable fixed jaw cheapens themanufacture, at the same time increasing the clutching efliciency to amaximum, as the best hardened material may be used and the teethaccurately and evenly cut thereon. With the exception of the wroughtchannel section 13, the whole wrench if desired may be cast economicallyand to best advantage.

Having now described my invention, that which I desire to cover byLetters Patent is:

1. In a wrench, in combination with a handle having a fixed jaw, arotary jaw pivoted on the handle and having an internal depression onone side and a slot through the facial walls transverse to the internaldepression and a stud on the handle adapted to enter the internal recessthrough the slot and to engage a boss in the internal recess atdetermined points to limit the travel of the rotary jaw about its pivot.

52. In a wrench, in combination with a handle having a fixed jaw, arotary jaw pivoted on the handle having an internal depression, atransverse slot through the side walls to the depression and acounter-bore around the pivot, a stud in the handle adapted to enter theinternal depression through the transverse slot in the walls of therotary jaw and to engage a boss in the depression at determined pointsand act as a stop to limit the movement of the jaw about its pivot, anda spiral spring in the counter bore surrounding the pivot adapted torotate the jaw on its pivot.

3. In a wrench in combination with a handle, a fixed jaw on the handle,a rotary jaw pivoted on the handle having a spiral gripping faceeccentric to the pivot, a counterbore around the pivot on one side, aninternal depression on the other side with a transverse inlet throughthe walls leading to the depression, a spring in the counterbore aroundthe pivot and a stud on the handle adapted to enter the internaldepression of the rotary jaw through the transverse inlet and engagestops in the internal clepression at determined positions to limit thetravel of the rotary jaw on its pivot.

In testimony whereof I affix my signature in presence of two witnesses.

KING A. HARVIE. Witnesses:

JOHN H. MCNULTY, EDWARD I. DROWNE.

flopies of this patent may be'obtained for five cents each, byaddressing the Commissioner of Eatents,

Washington, D. C.

